I would rubber band some nori sheets to a rock or two then place it near where the crabs hang out. You can supplement with some algae wafers too but the drawback with those is that the crabs aren't going to get 100% of the wafer in their mouth and little bits will get away.
Any type of food will work, the problem is being able to get it down to the crabs without it floating all over the place. You might have to get creative here.
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